How to troubleshoot a battery drain (Spector NS5CR)

[Rigetto]

Hi there,

I have a issue with my '90s Spector NS5CR (Emg 40DC with the EMG BTS preamp, soldered, 9V).

Well, it's started to drain my battery really fast, even if unplugged. How can I troubleshoot it?

Any hint? Do you guys need pictures of the electronic cavity?

Thanks

[itu]

Pictures please, sharp ones. 

 

Do you have a DMM (Digital MultiMeter)? If yes, start measuring from output jack.